Portable oxygen concentrator



FIG. 1 is an Isometric View of the portable oxygen concentrator of the present design.

FIG. 2 is a Front View of the portable oxygen concentrator of the present design.

FIG. 3 is a Back View of the portable oxygen concentrator of the present design.

FIG. 4 is a Left Side View of the portable oxygen concentrator of the present design.

FIG. 5 is a Right Side View of the portable oxygen concentrator of the present design.

FIG. 6 is a Top View of the portable oxygen concentrator of the present design.

FIG. 7 is a Bottom View of the portable oxygen concentrator of the present design; and,

FIG. 8 is an expanded view of the top portion of FIG. 1.

In the drawings, the broken lines depict unclaimed environment only and forms no part of the claimed design. 

CLAIM The ornamental design for a portable oxygen concentrator, as shown and described. 